Accent Depundent: Once when Courage asked for help regarding a mummy, Computer thought he meant mommy, since "mummy" is the British way of writing it.
Computer: If your mummy is coming for a visit, then give her flowers, you twit.
Courage: (frowns, retypes)
Computer: Oh, a mummy, that's much worse.
Adored by the Network: Cartoon Network decided the pilot should become its own series, and the show has spanned four entire seasons without a single threat of having it yanked off the air, despite its scary nature. This show is also one of the few cancelled originals to still air on a regular basis.
After the show completed its four-season, 52-episode run (typical for most cartoon series on cable networks such as Cartoon Network and Nickelodeon), many fans petitioned for a continuation, which both the network and John R. Dilworth considered, but ultimately, Dilworth decided not to continue with any further episodes or seasons. On the same token, a (possibly theatrical) movie was confirmed to be in the works, however, it never came to fruition.
Beam Me Up, Scotty!: A non-quote example: the instrument in the last episode is a bugle, not a trumpet, as it's commonly assumed.
Executive Meddling: The reason behind Courage's limited speech and constant babbling and screaming after the first season.
Fan Nickname: The "Perfect Trumpet Thingy" or "Eustace's Trumpet" for the blue thing in the first of Courage's nightmares in "Perfect" and "Violin Girl" for the Demon Head in "Courage in the Big Stinkin' City".
Courage, Muriel, and Eustace together as a group is usually called "the Bagges" or "the Bagge family" by fans.
The pilot, The Chicken From Outer Space, partly plays this straight and partly averts it. It's not on the Season 1 DVD, but Jon R Dilworth sells it through his online store.
Recycled Script: Season 3's "Curtain of Cruelty" has a similar plot to Season 2's "The Tower of Dr. Zalost", with anger and hostility infecting the Nowhere townspeople instead of sadness and depression.
Shrug of God: Because he defends the show as being just as open to interpretation as any other art, John Dilworth often responds to fan theories with a Blunt "Yes".
The Other Darrin: Lionel Wilson was replaced by Arthur Anderson as the voice of Eustace in the middle of the third season.
So many fans were saddened by the show's ending that an online petition was formed, and sent to both Cartoon Network and Stretch Films, asking for a continuation. Because of this, a fifth season of the series was considered, but ultimately never came to be.
On the same token, because of the series' popularity with fans, a movie was also up for consideration (whether theatrical or TV was never made clear), but nothing ever came out of it.
Series composer Jody Gray wanted to release a CD soundtrack of the show's music scoring and songs, and even asked fans to submit requests of specifics they'd like to be included in the soundtrack. Once again, nothing ever materialized.
Way back when, Dilworth was pitching his indie short The Dirty Birdie to Hanna-Barbera for the What a Cartoon! program, but they deemed the short unsuitable for TV, and Dilworth pitched what was to be his next indie effort The Chicken from Outer Space in order to receive funding for it, and the rest was history.